Brian Lumley 
In The Moons Of Borea 

Following the Timelock, the Quester, de Maringy, finds himself on the parallel universe of Borea. Borea – ice-planet – is a ravaged arena of psychic combat between the Warlord of the Plateau, Armandra and the Wind-Walker. This is the sequel to "The Clock of Dreams" and "Spawn of the Winds".